Berlin attacker had 14 aliases and was subject of repeated counterterror briefings

The Tunisian man who ploughed a truck into a Berlin Christmas market had lived under 14 aliases and was so well known to German officials that a key counterterrorism committee discussed his case seven times, suggesting the scale of the missed opportunities to thwart the December 19 attack.
The fresh details about Anis Amri - shot dead in Italy four days after the attack - emerged Thursday during testimony in the regional parliament of North-Rhine Westphalia, where the suspect once lived. German officials have already said that Amri had previously been flagged as a terrorism threat. But Ralf Jäger, the state’s interior minister, described for lawmakers in Düsseldorf how the Joint Counter-Terrorism Center, an institution coordinating the work of Germany’s security agencies, had discussed his case repeatedly.
Watch : Dashcam video shows truck rushing towards Berlin Christmas market

He also said that six months of surveillance had yielded nothing concrete, suggesting an operative highly skilled at hiding his resolve, or a lapse in German law enforcement to adequately monitor him.
Speaking to reporters on the day of the hearing, Jäger said that German officials felt they did not have enough on Amri to detain him.
